f(x)=2cos^2(3x)

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Solution for f(x)=2cos^2(3x) equation: 


Simplifying
f(x) = 2cos2(3x)

Multiply f * x
fx = 2cos2(3x)

Remove parenthesis around (3x)
fx = 2cos2 * 3x

Reorder the terms for easier multiplication:
fx = 2 * 3cos2 * x

Multiply 2 * 3
fx = 6cos2 * x

Multiply cos2 * x
fx = 6cos2x

Solving
fx = 6cos2x

Solving for variable 'f'.

Move all terms containing f to the left, all other terms to the right.

Divide each side by 'x'.
f = 6cos2

Simplifying
f = 6cos2

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